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Have you tried having images color copied onto clear acetate? I did this
awhile back, and liked the results. I do not think that the density of
color will be there, but its worth a try to see how you like the results.
Staples (an office supply chain in the North East) does them quite
reasonably, and will copy each image once for teaching purposes.
Also, do you have a computer in your classroom? The student version of
Fractal Painter, Dabbler II, has onionskin capabilities - if you have
access to a scanner, you could import the image which you want to discuss,
put a piece of digital onionskin over and do your drawing on top of that.
You will still see the original image as you draw. (Dabbler II costs about
$45 on special).
By the way, thanks. Your question has given me food for thought.